Keywords

Abstract

The traditional parameters to evaluate human
microcirculation such as mean values of skin blood flux
(SBF) and velocity of skin blood flow measured by laser
Doppler flowmetry (LDF) failed to find the biological
effects of magnetic field (MF) on human microcirculation
according to numerous researches. Although this
inefficacy of MF indicated by these traditional parameters,
other potential parameters were seldom investigated.
Therefore, this study aimed to find other potential
parameters by using time-frequency analysis as indicators
to investigate whether MF affects human microcirculation
in future studies. Continuous wavelet transform which has
superior frequency resolution in low frequency band was
applied in present study to convert two dimensional data
of flux signal with low frequency band into three
dimensional data involving the temporal and frequency
information of the original signal. Six characteristic peaks
identified relating to microvascular mechanism were
recognized in the frequency interval between 0.005 and 2
Hz and the amplitude of each peak varied with time. This
method may provide a new idea and method for the
analysis and processing human SBF signal and lay a
foundation for future study of MF effects on human
microcirculation. However, more studies are needed to
demonstrate the interesting and encouraging effects of MF
on untraditional parameters such as wavelet coefficients
of SBF signal and to explain the precise action
mechanism of MF on human microcirculation.